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Relay step-down control circuit and control method

A technology for controlling circuits and relays, applied in relays, circuits, electrical components, etc., can solve the problems of large relay coil loss and low reliability, and achieve the effects of reducing loss, solving low reliability, and solving large losses

Active Publication Date: 2018-01-12
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a relay step-down control circuit and control method to at least solve the problems of large relay coil loss and low reliability in the prior art

Method used

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  • Relay step-down control circuit and control method
  • Relay step-down control circuit and control method
  • Relay step-down control circuit and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The relay step-down control circuit provided by the present invention will be described below in conjunction with the accompanying drawings.

[0036] figure 1 An optional structural block diagram of the relay step-down control circuit of the present invention is shown, as figure 1 As shown, the relay step-down control circuit includes:

[0037] DC power supply 11;

[0038] The coil voltage feedback control circuit 14 is used to adjust the circuit according to the confirmation signal representing the pull-in state of the relay, and send a feedback signal; wherein preferably, the relay step-down control circuit may include a relay pull-in confirmation circuit 13 for judging the the pull-in state of the relay, and send the corresponding confirmation signal; as another embodiment, the relay step-down control circuit may not include the relay pull-in confirmation circuit 13, only by providing the confirmation signal to the coil voltage feedback control circuit 14. accompl...

Embodiment 2

[0057] Based on the relay step-down control circuit provided in Embodiment 1 above, a method for controlling the relay step-down control circuit is provided in this embodiment, specifically, image 3 An alternative flowchart showing the method, such as image 3 As shown, the method includes the following steps S302-306:

[0058] S302, determining the target voltage value required at both ends of the coil of the relay in different pull-in states;

[0059] S304, according to the determined target voltage values ​​required at both ends of the coil in different pull-in states of the relay, calculate the required resistance value of the resistance in the coil voltage feedback control circuit;

[0060] S306. Determine the resistance value in the coil voltage feedback control circuit according to the calculation result, so as to control the actual voltage at both ends of the relay coil to be the required target voltage value.

[0061] Among them, when the relay is in the non-pullin...

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PUM

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Abstract

The invention discloses a relay step-down control circuit and a control method. The relay step-down control circuit comprises a direct-current power supply, a relay pull-in confirmation circuit, a coil voltage feedback control circuit and a step-down switching power supply, the relay pull-in confirmation circuit is used for judging the pull-in state of a relay and transmitting corresponding confirmation signals, the coil voltage feedback control circuit is used for regulating the circuit according to the corresponding confirmation signal and transmitting feedback signals, the step-down switching power supply is used for stepping down the direct-current power supply according to the feedback signals, the voltage of two ends of a relay coil is controlled to be the rated voltage of a relay with a first scale value when the relay is not in the pull-in state, the voltage of the two ends of the relay coil is controlled to be the rated voltage of the relay with a second scale value when the relay is in the pull-in state, and the second scale value is smaller than the first scale value. The problems of large loss and low reliability of a relay coil in the prior art are solved, the relay coil loss is reduced, and the reliability is improved.

Description

technical field [0001] The invention relates to the technical field of relays, in particular to a relay step-down control circuit and a control method. Background technique [0002] As a basic electrical component, relays are widely used in various electrical cabinets and in various automatic control fields. They are simple and easy to operate, have good isolation between strong and weak currents, and are reliable in use. At present, relays with low voltages such as DC 24V, 12V, and 5V for coil control power are also widely used in low-voltage distribution boxes, DC and other equipment. [0003] Because the relay is limited by its main contact capacity, reliable pull-in guarantee and other factors, the loss of its control coil is relatively high. The 85°C specified in the specification seriously threatens the reliability and life of the relay, and causes heat accumulation in the electrical box, which further increases the temperature in the electrical box, affects the relia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H47/02
Inventor 刘克勤娄贺伟
Owner GREE ELECTRIC APPLIANCES INC